* The stone brick and mortar will be consumed at the end of the action.
* A building plan with no walls will decay in a few days, make sure you start at least one wall.
* The wall starts at 1QL. Each action including creating the wall adds (Mortar QL + Brick QL)/21 to the wall. The completed wall therefore has a quality of up to 1QL + 20 * (Mortar QL + Brick QL)/21. Depending on your masonry skill and quality of the tools you may get more or less on each action.
=== Inner walls ===